| http://www.w3.org/ns/prov#value | - onine, tyrosine, citrulline, N-acetyl lysine, methionine sulfoxide, or homoserine, or an apolar amino acid such as methionine, glycine or proline; Xaa17 is a basic, a polar, an aliphatic, an apolar or an acidic amino acid, for example, a basic amino acid such as histidine, lysine, arginine, 2,3-diaminopropionic acid, omithine, homoarginine, ??-amino-phenylalanine, and 2,4-diaminobutyric acid, or a
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